PIONEERPOS G24-LC manual Audio, Sidetone

Improved OEM Features

Technical Description

Figure 1-1, “System Overview,” on page 1-5displays the system overview which comprises the following links and layers:

Physical layer links:

•The terminal is connected to the G24-L using a physical RS-232 connection.

•The G24-L is connected to the GGSN using a GPRS link.

•The GGSN is connected to the Internet via some sort of physical connection (usually telephone or cable).

Point-to-point layer links:

•AT command protocol is used to transfer data between the terminal and the G24-L.

•After authentication, the G24-L is linked to the GGSN using PPP protocol.

•The GGSN is connected to its Internet service provider using some protocol.

TCP / UDP layer:

•The G24-L can transfer data with the WEB using either TCP/IP or UDP/IP protocols.

•The protocol stacks in the terminal or in the OEM must be managed when using TCP/IP or UDP/IP protocols. The G24-L software can manage these stacks internally. This enables the G24-L to relieve the terminal from the job of managing these protocols.

Note: Currently, the embedded TCP/IP feature may be used only for mobile-initiated connections. The embedded. TCP/IP feature cannot listen on a port for incoming connections.

Audio

Overview

The audio (digital and analog) feature in the G24-L module involves three main issues: path (routes the current input and output devices), gain (volume management) and algorithm. For more information, refer to “Audio” on page 3-155.

Features and Benefits

The following algorithm related features are provided:

Sidetone

Sidetone reduces the microphone audio input that is routed to the selected speaker so that the person speaking can hear himself or herself talking. This creates a slight echo because the speaker

1-8 G24-L AT Commands Reference Manual April 15, 2008